Quantum Limits on Measurement and Control of a Mechanical Oscillator

Name: Quantum Limits on Measurement and Control of a Mechanical Oscillator
Brand: Springer Nature
SKU: 9783319694313
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Springer Nature

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9783319694313

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This thesis reports on experiments in which the motion of a mechanical oscillator is measured with unprecedented precision. The position fluctuations of the oscillatora glass nanostringare measured with an imprecision that is sufficient to resolve its quantumzero-point motion within its thermal decoherence time. The concomitant observation of measurement back-action, in accordance with Heisenbergs uncertainty principle, verifies the principles of linear quantum measurements on a macroscopic mechanical object. The record of the measurement is used to perform feedback control so as to suppress both classical thermal motion and quantum measurement back-action. These results verify some of the central and long-standing predictions of quantum measurement theory applied to a macroscopic object. The act of measurement not only perturbs the subject of the measurementthe mechanical oscillatorbut also changes the state of the light used to make the measurement. This prediction is verified by demonstrating that the optical field, after having interacted with the mechanical oscillator, contains quantum correlations that render its quadrature fluctuations smaller than those of the vacuum i.e., the light is squeezed. Lastly, the thesis reports on some of the first feedback control experiments involving macroscopic objects in the quantum regime, together with an exploration of the quantum limit of feedback control. The book offers a pedagogical account of linear measurement theory, its realization via optical interferometry, and contains a detailed guide to precision optical interferometry.

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